SIT9002AC-18H33DX

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Programmable oscillators (POs) are devices that generate a precisely calibrated frequency to ensure reliable and consistent operation of the systems in which they are utilized. The SIT9002AC-18H33DX is an example of such a programmable oscillator, designed for frequency synthesis and control applications. In this article, we’ll discuss the application field and working principle of this oscillator.

Application Field

The SIT9002AC-18H33DX POs are ideal for a variety of applications including communication systems, test and measurement, automotive and industrial control, medical equipment, and many other applications requiring a precise and relatively low-cost frequency. In particular, it can be applied to applications that require a minimum frequency selectability of ±1.0%.

The SIT9002AC-18H33DX is particularly useful in communication systems due to its low power consumption and ability to provide precisely low frequency output. In addition, it can be used in very small packages with 1.0 x 0.7 mm format, making it particularly suitable for applications where size is an important consideration. In terms of industrial control, the SIT9002AC-18H33DX is also very attractive due to its wide temperature range of -20°C to +70°C.

Working Principle

Like other POs, the SIT9002AC-18H33DX works on the principle of phase-locked loop (PLL) technology. This involves the use of an oscillator, a variable frequency filter, and an analog and digital control scheme to generate an accurately regulated output frequency. The frequency is determined by the inputs of the oscillator, which can be programmed to generate frequencies ranging from 0 Hz to 220 MHz.

The SIT9002AC-18H33DX uses a conventional PLL architecture with a VCO, counter, charge pump and voltage controlled filter to generate its output signals. The VCO generates a signal that is divided down by the counter and fed into the charge pump and voltage controlled filter, where the desired output frequency is generated. The output frequency is then compared against the reference frequency, and the difference is used to control the charge pump and filter, ensuring a precise output frequency.

The SIT9002AC-18H33DX also incorporates an internal clock, allowing it to operate at speeds of up to 23MHz. This makes it well-suited for applications in which low speed but high accuracy and reliability are important, such as in radio test applications.

Overall, the SIT9002AC-18H33DX is an excellent choice for a wide variety of frequency synthesizer and control applications. It offers a wide range of features such as low power consumption, noise immunity, small form factor, and wide temperature range, making it well-suited for applications requiring superior performance and accuracy.

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